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The seals on the pistons in my mom's '02 saab 95 literally disintegrated after filling up with regular gas.
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My bet is she was getting E85 ethanol for gas...I don't care if its corn based and environmentally blah blah...that crap will ruin a normal engine quicker than not changing the oil! The ethanol will eat the seals...The only thing lower octane will do(to my knowledge) is kick in the knock sensor and cause the computer to compensate therefore giving you crappy mileage (possibly increase wear...depends on the motor) . Now if you've got a FLEX FUEL engine different story...they are made to run E85.
BTW...seals...pistons?????  I think you mean... valves
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...But we in it shall be rememberèd;
We few, we happy few, we band of brothers;
For he to-day that sheds his blood with me
Shall be my brother...
1994 RRC LWB, 82k miles, 4.2, Cornish Cream/Lightstone Interior, spring converted.
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